caa a22 4500 463217616 CHVBK 20180405153202.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00269-007-0151-0 doi (NATIONALLICENCE)springer-10.1007/s00269-007-0151-0 A new high-pressure and high-temperature polymorph of FeS [Elektronische Daten] [Hiroaki Ohfuji, Nagayoshi Sata, Hisao Kobayashi, Yasuo Ohishi, Kei Hirose, Tetsuo Irifune] A new polymorph of FeS has been observed at pressures above 30GPa at 1,300K by in situ synchrotron X-ray diffraction measurements in a laser-heated diamond anvil cell. It is stable up to, at least, 170GPa at 1,300K. The new phase (here called FeS VI) has an orthorhombic unit cell with lattice parameters a=4.8322 (17)Å, b=3.0321 (6)Å, and c=5.0209 (8)Å at 85GPa and 300K. Its topological framework is based on the NiAs-type structure as is the case for the other reported polymorphs (FeS I-V). The unit cell of FeS VI is, however, more distorted (contracted) along the [010] direction of the original NiAs-type cell. For example, the c/b axial ratio is ∼1.66 at 85GPa and 300K, which is considerably smaller than that of orthorhombic FeS II (∼1.72) and NiAs-type hexagonal FeS V (=√3≈1.73). The phase boundary between FeS IV and VI is expected to be located around 30GPa at 1,300K. The phase transition is accompanied by gradual and continuous changes in volume and axial ratios and may be second order. At room temperature, FeS VI becomes stable over FeS III at pressures above 36GPa. It is, therefore, suggested that the phase boundary of FeS III-VI and/or FeS IV-VI has negative pressure dependence. Springer-Verlag, 2007 Ohfuji Hiroaki Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, 790-8577, Matsuyama, Ehime, Japan aut Sata Nagayoshi Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, 237-0061, Yokosuka, Kanagawa, Japan aut Kobayashi Hisao Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Kamigori-cho, Ako-gun, 678-1297, Hyogo, Japan aut Ohishi Yasuo Japan Synchrotron Radiation Research Institute, 1-1-1 Koto, Sayo-cho, Sayo-gun, 679-5198, Hyogo, Japan aut Hirose Kei Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8551, Meguro, Tokyo, Japan aut Irifune Tetsuo Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, 790-8577, Matsuyama, Ehime, Japan aut Physics and Chemistry of Minerals Springer-Verlag 34/5(2007-07-01), 335-343 0342-1791 34:5<335 2007 34 269 https://doi.org/10.1007/s00269-007-0151-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00269-007-0151-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ohfuji Hiroaki Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, 790-8577, Matsuyama, Ehime, Japan aut NATIONALLICENCE 700 1- Sata Nagayoshi Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, 237-0061, Yokosuka, Kanagawa, Japan aut NATIONALLICENCE 700 1- Kobayashi Hisao Graduate School of Material Science, University of Hyogo, 3-2-1 Koto, Kamigori-cho, Ako-gun, 678-1297, Hyogo, Japan aut NATIONALLICENCE 700 1- Ohishi Yasuo Japan Synchrotron Radiation Research Institute, 1-1-1 Koto, Sayo-cho, Sayo-gun, 679-5198, Hyogo, Japan aut NATIONALLICENCE 700 1- Hirose Kei Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8551, Meguro, Tokyo, Japan aut NATIONALLICENCE 700 1- Irifune Tetsuo Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, 790-8577, Matsuyama, Ehime, Japan aut NATIONALLICENCE 773 0- Physics and Chemistry of Minerals Springer-Verlag 34/5(2007-07-01), 335-343 0342-1791 34:5<335 2007 34 269 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer